Medicinal compound and method of producing the same



UNITED fi'lA'l'lilS PATENT OFFICE.

JAY FRANK SCI-1AM VANIA, ASSIGNORS TO BE DELPHIA, PENNSYLVANIA,

BERG AND GEORGE W.

RMATOLOGIGAL RESEARCH LABORATORIES, OF PHILA- A CORPORATION 01 PENNSYLVANIA.

RAIZISS, O13 PHILADELPHIA, PENNSYL- No Drawing.

Specification. of Letters Patent.

Patented May 30, 1922.

Application filed April 21, 1920. Serial No. 375,433.

To (illicit-017L675 may concern.

Be it known th sane and Gnoncn United States, residing in the city at we, JAY FRANK SCI-1AM- vV. Rarzrss, citizens of the of Philadelphia, State of Pennsylvania, have jointly invented a cert ain new and useful Mediciclear, and exact description.

Our invention body having special utility for a new chemical the treatment relates to of skin diseases, including" psoriasis, a somewhat prevalent by loral applications disease,

heretofore treated of the pharmaceutical compound called chrysarobin as the best known local rem product is much edy, as to which our new superior as determined by reports from physicians through whom we have fully tested its therapeutic invention is also method of producing in carrymg out our process, m

body, we use as a tion of the new effects. Our coinprel'iensive of a novel the new product.

the producmaterial the aforesaid well known compound chrysarob of it show mlnor in the composition, all of purified, to the empiric and consist of an in color. having of 145 to 155 readily soluble in chloroform, and benzene. and derived from boiling goa or araroba powder purification, water, but acetic acid thoroughly in, and although samples and immaterial variations them answer when formula C H O amorphous powder, yellow a melting point, before Q, insoluble in with benzene or chloroform to obtain an ere haustive extraction and evaporating the solution to dryness.

From this body new product by of which the following I as a basis we produce our a new method or process,

is a practical eX- ample: The chrysarobin is dissolved by boiling' in glacial acetic acid, for which purgrams glacial acetic aci after being brought to boiling pose 4O grams of the chrysarobin and 20 of tin metal are suspended in 600 c. c,

d, in a suitable flask, and for about 15 minutes the chrysarobin will be dissolved,

whereupon c. c. as a maximum,

trated hydrochlo chrysarobin solution, separatory funnel;

tinued for about c. 0. additional 0 starting manner, followed by a further boiling for about another 4L0 minutes, and an additional 25 c. c. about of H. Cl. then added in like manner as before. Sometimes however, as we have discovered with some samples of chrysarobin, an aggregrate of H. Cl. exceeding to c. c. will produce a precipitate which should be avoided.

The boiling is then continued for about an hour and a half and ten grams of charcoal introduced near the end of that period; after which the hot solution is filtered to free it from undissolved metal, charcoal and other impurities.

The filtrate is then crystallized by cooling, first by rapidly stirring and then allowing it to stand for an hour or two in the cold whereupon the precipitate is deprived of all traces of acetic acid by successive washings first with water and then, if need be, with cautious use of ethyl alcohol and ether, as in both of these last named reagents it is slightly soluble, and hence liable to climinish the quality and ield, which should be from 25 to 30 grams from the quantities first above stated.

The product is subject to deterioration from the action of light and moisture. and hence is best preserved in stoppered and amber colored glass bottles or evacuated ampoule. The finished product is in the form of very small crystals, yellow in color, hav ing a melting point of 190 C. though a slight decomposition will ordinarily begin at 170 it. slightly soluble in or absorbent of moisture, more readily soluble in ethyl alcohol, somewhat less so in methyl alcohol and ether, and easily soluble in chloroform.

Having thus described our invention, we claim:

1. The new medicinal product described, which is the reduced derivative of an extract of araroba powder, is minutely crystalline in form, yellow in color, melting at about 190 (1, slightly soluble in ether and methyl alcohol, and more soluble in glacial acetic acid, chloroform, benzene and ethyl alcohol.

2. The process described, of producing the reduced derivative of an extract of araroba powder, which consists in subjectin an acetic acid and tin metal solution of said extract to the prolonged action of hydrochloric acid at a boiling temperature, filtering the same and crystallizing the precipitate. V

3. The process described which consists in dissolving the amorphous powder extract of araroba powder in acetic acid, in the presence of tin metal, at a boiling temperature, subjecting the solution to the repeated action of hydrochloric acid at a prolonged boiling temperature, filtering the same, Washing the fitrate for the complete removal of acetic acid, and finally cooling the residue for the separating out of the crystalline precipitate.

In testimony whereof, we. have hereunto affixed our signatures this 16th dayof April, 15

JAY FRANK SCHAMBERG. GEORGE W. -RAI'ZISS.

Witnesses:

I. M. TUNIS, ALEXANDER PARK. 

